here's a game i came up with. first person comes up with a category. the next person has to name something for every letter in the alphabet in that category, or at least try to. then they have to come with another category. for example:

oops, we both posted, that's ok, we'll just have the next catagory be Songs since you forgot to put one

EDIT: 3 more rules

1.) Looking stuff up is ok. I'd like to call that research. But try to come up with as much stuff on your own. Don't just copy/paste a list from somewhere.
2.) Creativity is fine. Putting specific names or imaginary things is cool. Like if I put Lassie or Unicorn for animals that would have been fine. But don't make stuff up at the top of your head either.
3.) If two people post at once, it's ok. The next person to go can just pick whichever category they want to alphabetize and then they can put the other category for the next person, or they choose a different catagory. Or they can do both catagories too. lol